1 /* 2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. 3 * Copyright (C) 2010 Red Hat, Inc. 4 * All Rights Reserved. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it would be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 18 */ 19 #include "xfs.h" 20 #include "xfs_fs.h" 21 #include "xfs_shared.h" 22 #include "xfs_format.h" 23 #include "xfs_log_format.h" 24 #include "xfs_trans_resv.h" 25 #include "xfs_sb.h" 26 #include "xfs_ag.h" 27 #include "xfs_mount.h" 28 #include "xfs_da_format.h" 29 #include "xfs_da_btree.h" 30 #include "xfs_inode.h" 31 #include "xfs_bmap_btree.h" 32 #include "xfs_ialloc.h" 33 #include "xfs_quota.h" 34 #include "xfs_trans.h" 35 #include "xfs_qm.h" 36 #include "xfs_trans_space.h" 37 #include "xfs_trace.h" 38 39 /* 40 * A buffer has a format structure overhead in the log in addition 41 * to the data, so we need to take this into account when reserving 42 * space in a transaction for a buffer. Round the space required up 43 * to a multiple of 128 bytes so that we don't change the historical 44 * reservation that has been used for this overhead. 45 */ 46 STATIC uint 47 xfs_buf_log_overhead(void) 48 { 49 return round_up(sizeof(struct xlog_op_header) + 50 sizeof(struct xfs_buf_log_format), 128); 51 } 52 53 /* 54 * Calculate out transaction log reservation per item in bytes. 55 * 56 * The nbufs argument is used to indicate the number of items that 57 * will be changed in a transaction. size is used to tell how many 58 * bytes should be reserved per item. 59 */ 60 STATIC uint 61 xfs_calc_buf_res( 62 uint nbufs, 63 uint size) 64 { 65 return nbufs * (size + xfs_buf_log_overhead()); 66 } 67 68 /* 69 * Logging inodes is really tricksy. They are logged in memory format, 70 * which means that what we write into the log doesn't directly translate into 71 * the amount of space they use on disk. 72 * 73 * Case in point - btree format forks in memory format use more space than the 74 * on-disk format. In memory, the buffer contains a normal btree block header so 75 * the btree code can treat it as though it is just another generic buffer. 76 * However, when we write it to the inode fork, we don't write all of this 77 * header as it isn't needed. e.g. the root is only ever in the inode, so 78 * there's no need for sibling pointers which would waste 16 bytes of space. 79 * 80 * Hence when we have an inode with a maximally sized btree format fork, then 81 * amount of information we actually log is greater than the size of the inode 82 * on disk. Hence we need an inode reservation function that calculates all this 83 * correctly. So, we log: 84 * 85 * - 4 log op headers for object 86 * - for the ilf, the inode core and 2 forks 87 * - inode log format object 88 * - the inode core 89 * - two inode forks containing bmap btree root blocks. 90 * - the btree data contained by both forks will fit into the inode size, 91 * hence when combined with the inode core above, we have a total of the 92 * actual inode size. 93 * - the BMBT headers need to be accounted separately, as they are 94 * additional to the records and pointers that fit inside the inode 95 * forks. 96 */ 97 STATIC uint 98 xfs_calc_inode_res( 99 struct xfs_mount *mp, 100 uint ninodes) 101 { 102 return ninodes * 103 (4 * sizeof(struct xlog_op_header) + 104 sizeof(struct xfs_inode_log_format) + 105 mp->m_sb.sb_inodesize + 106 2 * XFS_BMBT_BLOCK_LEN(mp)); 107 } 108 109 /* 110 * The free inode btree is a conditional feature and the log reservation 111 * requirements differ slightly from that of the traditional inode allocation 112 * btree. The finobt tracks records for inode chunks with at least one free 113 * inode. A record can be removed from the tree for an inode allocation 114 * or free and thus the finobt reservation is unconditional across: 115 * 116 * - inode allocation 117 * - inode free 118 * - inode chunk allocation 119 * 120 * The 'modify' param indicates to include the record modification scenario. The 121 * 'alloc' param indicates to include the reservation for free space btree 122 * modifications on behalf of finobt modifications. This is required only for 123 * transactions that do not already account for free space btree modifications. 124 * 125 * the free inode btree: max depth * block size 126 * the allocation btrees: 2 trees * (max depth - 1) * block size 127 * the free inode btree entry: block size 128 */ 129 STATIC uint 130 xfs_calc_finobt_res( 131 struct xfs_mount *mp, 132 int alloc, 133 int modify) 134 { 135 uint res; 136 137 if (!xfs_sb_version_hasfinobt(&mp->m_sb)) 138 return 0; 139 140 res = xfs_calc_buf_res(mp->m_in_maxlevels, XFS_FSB_TO_B(mp, 1)); 141 if (alloc) 142 res += xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1), 143 XFS_FSB_TO_B(mp, 1)); 144 if (modify) 145 res += (uint)XFS_FSB_TO_B(mp, 1); 146 147 return res; 148 } 149 150 /* 151 * Various log reservation values. 152 * 153 * These are based on the size of the file system block because that is what 154 * most transactions manipulate. Each adds in an additional 128 bytes per 155 * item logged to try to account for the overhead of the transaction mechanism. 156 * 157 * Note: Most of the reservations underestimate the number of allocation 158 * groups into which they could free extents in the xfs_bmap_finish() call. 159 * This is because the number in the worst case is quite high and quite 160 * unusual. In order to fix this we need to change xfs_bmap_finish() to free 161 * extents in only a single AG at a time. This will require changes to the 162 * EFI code as well, however, so that the EFI for the extents not freed is 163 * logged again in each transaction. See SGI PV #261917. 164 * 165 * Reservation functions here avoid a huge stack in xfs_trans_init due to 166 * register overflow from temporaries in the calculations. 167 */ 168 169 170 /* 171 * In a write transaction we can allocate a maximum of 2 172 * extents. This gives: 173 * the inode getting the new extents: inode size 174 * the inode's bmap btree: max depth * block size 175 * the agfs of the ags from which the extents are allocated: 2 * sector 176 * the superblock free block counter: sector size 177 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 178 * And the bmap_finish transaction can free bmap blocks in a join: 179 * the agfs of the ags containing the blocks: 2 * sector size 180 * the agfls of the ags containing the blocks: 2 * sector size 181 * the super block free block counter: sector size 182 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 183 */ 184 STATIC uint 185 xfs_calc_write_reservation( 186 struct xfs_mount *mp) 187 { 188 return XFS_DQUOT_LOGRES(mp) + 189 MAX((xfs_calc_inode_res(mp, 1) + 190 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK), 191 XFS_FSB_TO_B(mp, 1)) + 192 xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) + 193 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2), 194 XFS_FSB_TO_B(mp, 1))), 195 (xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) + 196 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2), 197 XFS_FSB_TO_B(mp, 1)))); 198 } 199 200 /* 201 * In truncating a file we free up to two extents at once. We can modify: 202 * the inode being truncated: inode size 203 * the inode's bmap btree: (max depth + 1) * block size 204 * And the bmap_finish transaction can free the blocks and bmap blocks: 205 * the agf for each of the ags: 4 * sector size 206 * the agfl for each of the ags: 4 * sector size 207 * the super block to reflect the freed blocks: sector size 208 * worst case split in allocation btrees per extent assuming 4 extents: 209 * 4 exts * 2 trees * (2 * max depth - 1) * block size 210 * the inode btree: max depth * blocksize 211 * the allocation btrees: 2 trees * (max depth - 1) * block size 212 */ 213 STATIC uint 214 xfs_calc_itruncate_reservation( 215 struct xfs_mount *mp) 216 { 217 return XFS_DQUOT_LOGRES(mp) + 218 MAX((xfs_calc_inode_res(mp, 1) + 219 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) + 1, 220 XFS_FSB_TO_B(mp, 1))), 221 (xfs_calc_buf_res(9, mp->m_sb.sb_sectsize) + 222 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 4), 223 XFS_FSB_TO_B(mp, 1)) + 224 xfs_calc_buf_res(5, 0) + 225 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1), 226 XFS_FSB_TO_B(mp, 1)) + 227 xfs_calc_buf_res(2 + mp->m_ialloc_blks + 228 mp->m_in_maxlevels, 0))); 229 } 230 231 /* 232 * In renaming a files we can modify: 233 * the four inodes involved: 4 * inode size 234 * the two directory btrees: 2 * (max depth + v2) * dir block size 235 * the two directory bmap btrees: 2 * max depth * block size 236 * And the bmap_finish transaction can free dir and bmap blocks (two sets 237 * of bmap blocks) giving: 238 * the agf for the ags in which the blocks live: 3 * sector size 239 * the agfl for the ags in which the blocks live: 3 * sector size 240 * the superblock for the free block count: sector size 241 * the allocation btrees: 3 exts * 2 trees * (2 * max depth - 1) * block size 242 */ 243 STATIC uint 244 xfs_calc_rename_reservation( 245 struct xfs_mount *mp) 246 { 247 return XFS_DQUOT_LOGRES(mp) + 248 MAX((xfs_calc_inode_res(mp, 4) + 249 xfs_calc_buf_res(2 * XFS_DIROP_LOG_COUNT(mp), 250 XFS_FSB_TO_B(mp, 1))), 251 (xfs_calc_buf_res(7, mp->m_sb.sb_sectsize) + 252 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 3), 253 XFS_FSB_TO_B(mp, 1)))); 254 } 255 256 /* 257 * For removing an inode from unlinked list at first, we can modify: 258 * the agi hash list and counters: sector size 259 * the on disk inode before ours in the agi hash list: inode cluster size 260 */ 261 STATIC uint 262 xfs_calc_iunlink_remove_reservation( 263 struct xfs_mount *mp) 264 { 265 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 266 max_t(uint, XFS_FSB_TO_B(mp, 1), mp->m_inode_cluster_size); 267 } 268 269 /* 270 * For creating a link to an inode: 271 * the parent directory inode: inode size 272 * the linked inode: inode size 273 * the directory btree could split: (max depth + v2) * dir block size 274 * the directory bmap btree could join or split: (max depth + v2) * blocksize 275 * And the bmap_finish transaction can free some bmap blocks giving: 276 * the agf for the ag in which the blocks live: sector size 277 * the agfl for the ag in which the blocks live: sector size 278 * the superblock for the free block count: sector size 279 * the allocation btrees: 2 trees * (2 * max depth - 1) * block size 280 */ 281 STATIC uint 282 xfs_calc_link_reservation( 283 struct xfs_mount *mp) 284 { 285 return XFS_DQUOT_LOGRES(mp) + 286 xfs_calc_iunlink_remove_reservation(mp) + 287 MAX((xfs_calc_inode_res(mp, 2) + 288 xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), 289 XFS_FSB_TO_B(mp, 1))), 290 (xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) + 291 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1), 292 XFS_FSB_TO_B(mp, 1)))); 293 } 294 295 /* 296 * For adding an inode to unlinked list we can modify: 297 * the agi hash list: sector size 298 * the unlinked inode: inode size 299 */ 300 STATIC uint 301 xfs_calc_iunlink_add_reservation(xfs_mount_t *mp) 302 { 303 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 304 xfs_calc_inode_res(mp, 1); 305 } 306 307 /* 308 * For removing a directory entry we can modify: 309 * the parent directory inode: inode size 310 * the removed inode: inode size 311 * the directory btree could join: (max depth + v2) * dir block size 312 * the directory bmap btree could join or split: (max depth + v2) * blocksize 313 * And the bmap_finish transaction can free the dir and bmap blocks giving: 314 * the agf for the ag in which the blocks live: 2 * sector size 315 * the agfl for the ag in which the blocks live: 2 * sector size 316 * the superblock for the free block count: sector size 317 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 318 */ 319 STATIC uint 320 xfs_calc_remove_reservation( 321 struct xfs_mount *mp) 322 { 323 return XFS_DQUOT_LOGRES(mp) + 324 xfs_calc_iunlink_add_reservation(mp) + 325 MAX((xfs_calc_inode_res(mp, 1) + 326 xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), 327 XFS_FSB_TO_B(mp, 1))), 328 (xfs_calc_buf_res(4, mp->m_sb.sb_sectsize) + 329 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2), 330 XFS_FSB_TO_B(mp, 1)))); 331 } 332 333 /* 334 * For create, break it in to the two cases that the transaction 335 * covers. We start with the modify case - allocation done by modification 336 * of the state of existing inodes - and the allocation case. 337 */ 338 339 /* 340 * For create we can modify: 341 * the parent directory inode: inode size 342 * the new inode: inode size 343 * the inode btree entry: block size 344 * the superblock for the nlink flag: sector size 345 * the directory btree: (max depth + v2) * dir block size 346 * the directory inode's bmap btree: (max depth + v2) * block size 347 * the finobt (record modification and allocation btrees) 348 */ 349 STATIC uint 350 xfs_calc_create_resv_modify( 351 struct xfs_mount *mp) 352 { 353 return xfs_calc_inode_res(mp, 2) + 354 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 355 (uint)XFS_FSB_TO_B(mp, 1) + 356 xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), XFS_FSB_TO_B(mp, 1)) + 357 xfs_calc_finobt_res(mp, 1, 1); 358 } 359 360 /* 361 * For create we can allocate some inodes giving: 362 * the agi and agf of the ag getting the new inodes: 2 * sectorsize 363 * the superblock for the nlink flag: sector size 364 * the inode blocks allocated: mp->m_ialloc_blks * blocksize 365 * the inode btree: max depth * blocksize 366 * the allocation btrees: 2 trees * (max depth - 1) * block size 367 */ 368 STATIC uint 369 xfs_calc_create_resv_alloc( 370 struct xfs_mount *mp) 371 { 372 return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) + 373 mp->m_sb.sb_sectsize + 374 xfs_calc_buf_res(mp->m_ialloc_blks, XFS_FSB_TO_B(mp, 1)) + 375 xfs_calc_buf_res(mp->m_in_maxlevels, XFS_FSB_TO_B(mp, 1)) + 376 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1), 377 XFS_FSB_TO_B(mp, 1)); 378 } 379 380 STATIC uint 381 __xfs_calc_create_reservation( 382 struct xfs_mount *mp) 383 { 384 return XFS_DQUOT_LOGRES(mp) + 385 MAX(xfs_calc_create_resv_alloc(mp), 386 xfs_calc_create_resv_modify(mp)); 387 } 388 389 /* 390 * For icreate we can allocate some inodes giving: 391 * the agi and agf of the ag getting the new inodes: 2 * sectorsize 392 * the superblock for the nlink flag: sector size 393 * the inode btree: max depth * blocksize 394 * the allocation btrees: 2 trees * (max depth - 1) * block size 395 * the finobt (record insertion) 396 */ 397 STATIC uint 398 xfs_calc_icreate_resv_alloc( 399 struct xfs_mount *mp) 400 { 401 return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) + 402 mp->m_sb.sb_sectsize + 403 xfs_calc_buf_res(mp->m_in_maxlevels, XFS_FSB_TO_B(mp, 1)) + 404 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1), 405 XFS_FSB_TO_B(mp, 1)) + 406 xfs_calc_finobt_res(mp, 0, 0); 407 } 408 409 STATIC uint 410 xfs_calc_icreate_reservation(xfs_mount_t *mp) 411 { 412 return XFS_DQUOT_LOGRES(mp) + 413 MAX(xfs_calc_icreate_resv_alloc(mp), 414 xfs_calc_create_resv_modify(mp)); 415 } 416 417 STATIC uint 418 xfs_calc_create_reservation( 419 struct xfs_mount *mp) 420 { 421 if (xfs_sb_version_hascrc(&mp->m_sb)) 422 return xfs_calc_icreate_reservation(mp); 423 return __xfs_calc_create_reservation(mp); 424 425 } 426 427 STATIC uint 428 xfs_calc_create_tmpfile_reservation( 429 struct xfs_mount *mp) 430 { 431 uint res = XFS_DQUOT_LOGRES(mp); 432 433 if (xfs_sb_version_hascrc(&mp->m_sb)) 434 res += xfs_calc_icreate_resv_alloc(mp); 435 else 436 res += xfs_calc_create_resv_alloc(mp); 437 438 return res + xfs_calc_iunlink_add_reservation(mp); 439 } 440 441 /* 442 * Making a new directory is the same as creating a new file. 443 */ 444 STATIC uint 445 xfs_calc_mkdir_reservation( 446 struct xfs_mount *mp) 447 { 448 return xfs_calc_create_reservation(mp); 449 } 450 451 452 /* 453 * Making a new symplink is the same as creating a new file, but 454 * with the added blocks for remote symlink data which can be up to 1kB in 455 * length (MAXPATHLEN). 456 */ 457 STATIC uint 458 xfs_calc_symlink_reservation( 459 struct xfs_mount *mp) 460 { 461 return xfs_calc_create_reservation(mp) + 462 xfs_calc_buf_res(1, MAXPATHLEN); 463 } 464 465 /* 466 * In freeing an inode we can modify: 467 * the inode being freed: inode size 468 * the super block free inode counter: sector size 469 * the agi hash list and counters: sector size 470 * the inode btree entry: block size 471 * the on disk inode before ours in the agi hash list: inode cluster size 472 * the inode btree: max depth * blocksize 473 * the allocation btrees: 2 trees * (max depth - 1) * block size 474 * the finobt (record insertion, removal or modification) 475 */ 476 STATIC uint 477 xfs_calc_ifree_reservation( 478 struct xfs_mount *mp) 479 { 480 return XFS_DQUOT_LOGRES(mp) + 481 xfs_calc_inode_res(mp, 1) + 482 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 483 xfs_calc_buf_res(1, XFS_FSB_TO_B(mp, 1)) + 484 xfs_calc_iunlink_remove_reservation(mp) + 485 xfs_calc_buf_res(1, 0) + 486 xfs_calc_buf_res(2 + mp->m_ialloc_blks + 487 mp->m_in_maxlevels, 0) + 488 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1), 489 XFS_FSB_TO_B(mp, 1)) + 490 xfs_calc_finobt_res(mp, 0, 1); 491 } 492 493 /* 494 * When only changing the inode we log the inode and possibly the superblock 495 * We also add a bit of slop for the transaction stuff. 496 */ 497 STATIC uint 498 xfs_calc_ichange_reservation( 499 struct xfs_mount *mp) 500 { 501 return XFS_DQUOT_LOGRES(mp) + 502 xfs_calc_inode_res(mp, 1) + 503 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize); 504 505 } 506 507 /* 508 * Growing the data section of the filesystem. 509 * superblock 510 * agi and agf 511 * allocation btrees 512 */ 513 STATIC uint 514 xfs_calc_growdata_reservation( 515 struct xfs_mount *mp) 516 { 517 return xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) + 518 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1), 519 XFS_FSB_TO_B(mp, 1)); 520 } 521 522 /* 523 * Growing the rt section of the filesystem. 524 * In the first set of transactions (ALLOC) we allocate space to the 525 * bitmap or summary files. 526 * superblock: sector size 527 * agf of the ag from which the extent is allocated: sector size 528 * bmap btree for bitmap/summary inode: max depth * blocksize 529 * bitmap/summary inode: inode size 530 * allocation btrees for 1 block alloc: 2 * (2 * maxdepth - 1) * blocksize 531 */ 532 STATIC uint 533 xfs_calc_growrtalloc_reservation( 534 struct xfs_mount *mp) 535 { 536 return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) + 537 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK), 538 XFS_FSB_TO_B(mp, 1)) + 539 xfs_calc_inode_res(mp, 1) + 540 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1), 541 XFS_FSB_TO_B(mp, 1)); 542 } 543 544 /* 545 * Growing the rt section of the filesystem. 546 * In the second set of transactions (ZERO) we zero the new metadata blocks. 547 * one bitmap/summary block: blocksize 548 */ 549 STATIC uint 550 xfs_calc_growrtzero_reservation( 551 struct xfs_mount *mp) 552 { 553 return xfs_calc_buf_res(1, mp->m_sb.sb_blocksize); 554 } 555 556 /* 557 * Growing the rt section of the filesystem. 558 * In the third set of transactions (FREE) we update metadata without 559 * allocating any new blocks. 560 * superblock: sector size 561 * bitmap inode: inode size 562 * summary inode: inode size 563 * one bitmap block: blocksize 564 * summary blocks: new summary size 565 */ 566 STATIC uint 567 xfs_calc_growrtfree_reservation( 568 struct xfs_mount *mp) 569 { 570 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 571 xfs_calc_inode_res(mp, 2) + 572 xfs_calc_buf_res(1, mp->m_sb.sb_blocksize) + 573 xfs_calc_buf_res(1, mp->m_rsumsize); 574 } 575 576 /* 577 * Logging the inode modification timestamp on a synchronous write. 578 * inode 579 */ 580 STATIC uint 581 xfs_calc_swrite_reservation( 582 struct xfs_mount *mp) 583 { 584 return xfs_calc_inode_res(mp, 1); 585 } 586 587 /* 588 * Logging the inode mode bits when writing a setuid/setgid file 589 * inode 590 */ 591 STATIC uint 592 xfs_calc_writeid_reservation( 593 struct xfs_mount *mp) 594 { 595 return xfs_calc_inode_res(mp, 1); 596 } 597 598 /* 599 * Converting the inode from non-attributed to attributed. 600 * the inode being converted: inode size 601 * agf block and superblock (for block allocation) 602 * the new block (directory sized) 603 * bmap blocks for the new directory block 604 * allocation btrees 605 */ 606 STATIC uint 607 xfs_calc_addafork_reservation( 608 struct xfs_mount *mp) 609 { 610 return XFS_DQUOT_LOGRES(mp) + 611 xfs_calc_inode_res(mp, 1) + 612 xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) + 613 xfs_calc_buf_res(1, mp->m_dir_geo->blksize) + 614 xfs_calc_buf_res(XFS_DAENTER_BMAP1B(mp, XFS_DATA_FORK) + 1, 615 XFS_FSB_TO_B(mp, 1)) + 616 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1), 617 XFS_FSB_TO_B(mp, 1)); 618 } 619 620 /* 621 * Removing the attribute fork of a file 622 * the inode being truncated: inode size 623 * the inode's bmap btree: max depth * block size 624 * And the bmap_finish transaction can free the blocks and bmap blocks: 625 * the agf for each of the ags: 4 * sector size 626 * the agfl for each of the ags: 4 * sector size 627 * the super block to reflect the freed blocks: sector size 628 * worst case split in allocation btrees per extent assuming 4 extents: 629 * 4 exts * 2 trees * (2 * max depth - 1) * block size 630 */ 631 STATIC uint 632 xfs_calc_attrinval_reservation( 633 struct xfs_mount *mp) 634 { 635 return MAX((xfs_calc_inode_res(mp, 1) + 636 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK), 637 XFS_FSB_TO_B(mp, 1))), 638 (xfs_calc_buf_res(9, mp->m_sb.sb_sectsize) + 639 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 4), 640 XFS_FSB_TO_B(mp, 1)))); 641 } 642 643 /* 644 * Setting an attribute at mount time. 645 * the inode getting the attribute 646 * the superblock for allocations 647 * the agfs extents are allocated from 648 * the attribute btree * max depth 649 * the inode allocation btree 650 * Since attribute transaction space is dependent on the size of the attribute, 651 * the calculation is done partially at mount time and partially at runtime(see 652 * below). 653 */ 654 STATIC uint 655 xfs_calc_attrsetm_reservation( 656 struct xfs_mount *mp) 657 { 658 return XFS_DQUOT_LOGRES(mp) + 659 xfs_calc_inode_res(mp, 1) + 660 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 661 xfs_calc_buf_res(XFS_DA_NODE_MAXDEPTH, XFS_FSB_TO_B(mp, 1)); 662 } 663 664 /* 665 * Setting an attribute at runtime, transaction space unit per block. 666 * the superblock for allocations: sector size 667 * the inode bmap btree could join or split: max depth * block size 668 * Since the runtime attribute transaction space is dependent on the total 669 * blocks needed for the 1st bmap, here we calculate out the space unit for 670 * one block so that the caller could figure out the total space according 671 * to the attibute extent length in blocks by: 672 * ext * M_RES(mp)->tr_attrsetrt.tr_logres 673 */ 674 STATIC uint 675 xfs_calc_attrsetrt_reservation( 676 struct xfs_mount *mp) 677 { 678 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 679 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK), 680 XFS_FSB_TO_B(mp, 1)); 681 } 682 683 /* 684 * Removing an attribute. 685 * the inode: inode size 686 * the attribute btree could join: max depth * block size 687 * the inode bmap btree could join or split: max depth * block size 688 * And the bmap_finish transaction can free the attr blocks freed giving: 689 * the agf for the ag in which the blocks live: 2 * sector size 690 * the agfl for the ag in which the blocks live: 2 * sector size 691 * the superblock for the free block count: sector size 692 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 693 */ 694 STATIC uint 695 xfs_calc_attrrm_reservation( 696 struct xfs_mount *mp) 697 { 698 return XFS_DQUOT_LOGRES(mp) + 699 MAX((xfs_calc_inode_res(mp, 1) + 700 xfs_calc_buf_res(XFS_DA_NODE_MAXDEPTH, 701 XFS_FSB_TO_B(mp, 1)) + 702 (uint)XFS_FSB_TO_B(mp, 703 XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK)) + 704 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK), 0)), 705 (xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) + 706 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2), 707 XFS_FSB_TO_B(mp, 1)))); 708 } 709 710 /* 711 * Clearing a bad agino number in an agi hash bucket. 712 */ 713 STATIC uint 714 xfs_calc_clear_agi_bucket_reservation( 715 struct xfs_mount *mp) 716 { 717 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize); 718 } 719 720 /* 721 * Clearing the quotaflags in the superblock. 722 * the super block for changing quota flags: sector size 723 */ 724 STATIC uint 725 xfs_calc_qm_sbchange_reservation( 726 struct xfs_mount *mp) 727 { 728 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize); 729 } 730 731 /* 732 * Adjusting quota limits. 733 * the xfs_disk_dquot_t: sizeof(struct xfs_disk_dquot) 734 */ 735 STATIC uint 736 xfs_calc_qm_setqlim_reservation( 737 struct xfs_mount *mp) 738 { 739 return xfs_calc_buf_res(1, sizeof(struct xfs_disk_dquot)); 740 } 741 742 /* 743 * Allocating quota on disk if needed. 744 * the write transaction log space for quota file extent allocation 745 * the unit of quota allocation: one system block size 746 */ 747 STATIC uint 748 xfs_calc_qm_dqalloc_reservation( 749 struct xfs_mount *mp) 750 { 751 return xfs_calc_write_reservation(mp) + 752 xfs_calc_buf_res(1, 753 XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) - 1); 754 } 755 756 /* 757 * Turning off quotas. 758 * the xfs_qoff_logitem_t: sizeof(struct xfs_qoff_logitem) * 2 759 * the superblock for the quota flags: sector size 760 */ 761 STATIC uint 762 xfs_calc_qm_quotaoff_reservation( 763 struct xfs_mount *mp) 764 { 765 return sizeof(struct xfs_qoff_logitem) * 2 + 766 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize); 767 } 768 769 /* 770 * End of turning off quotas. 771 * the xfs_qoff_logitem_t: sizeof(struct xfs_qoff_logitem) * 2 772 */ 773 STATIC uint 774 xfs_calc_qm_quotaoff_end_reservation( 775 struct xfs_mount *mp) 776 { 777 return sizeof(struct xfs_qoff_logitem) * 2; 778 } 779 780 /* 781 * Syncing the incore super block changes to disk. 782 * the super block to reflect the changes: sector size 783 */ 784 STATIC uint 785 xfs_calc_sb_reservation( 786 struct xfs_mount *mp) 787 { 788 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize); 789 } 790 791 void 792 xfs_trans_resv_calc( 793 struct xfs_mount *mp, 794 struct xfs_trans_resv *resp) 795 { 796 /* 797 * The following transactions are logged in physical format and 798 * require a permanent reservation on space. 799 */ 800 resp->tr_write.tr_logres = xfs_calc_write_reservation(mp); 801 resp->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT; 802 resp->tr_write.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 803 804 resp->tr_itruncate.tr_logres = xfs_calc_itruncate_reservation(mp); 805 resp->tr_itruncate.tr_logcount = XFS_ITRUNCATE_LOG_COUNT; 806 resp->tr_itruncate.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 807 808 resp->tr_rename.tr_logres = xfs_calc_rename_reservation(mp); 809 resp->tr_rename.tr_logcount = XFS_RENAME_LOG_COUNT; 810 resp->tr_rename.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 811 812 resp->tr_link.tr_logres = xfs_calc_link_reservation(mp); 813 resp->tr_link.tr_logcount = XFS_LINK_LOG_COUNT; 814 resp->tr_link.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 815 816 resp->tr_remove.tr_logres = xfs_calc_remove_reservation(mp); 817 resp->tr_remove.tr_logcount = XFS_REMOVE_LOG_COUNT; 818 resp->tr_remove.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 819 820 resp->tr_symlink.tr_logres = xfs_calc_symlink_reservation(mp); 821 resp->tr_symlink.tr_logcount = XFS_SYMLINK_LOG_COUNT; 822 resp->tr_symlink.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 823 824 resp->tr_create.tr_logres = xfs_calc_create_reservation(mp); 825 resp->tr_create.tr_logcount = XFS_CREATE_LOG_COUNT; 826 resp->tr_create.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 827 828 resp->tr_create_tmpfile.tr_logres = 829 xfs_calc_create_tmpfile_reservation(mp); 830 resp->tr_create_tmpfile.tr_logcount = XFS_CREATE_TMPFILE_LOG_COUNT; 831 resp->tr_create_tmpfile.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 832 833 resp->tr_mkdir.tr_logres = xfs_calc_mkdir_reservation(mp); 834 resp->tr_mkdir.tr_logcount = XFS_MKDIR_LOG_COUNT; 835 resp->tr_mkdir.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 836 837 resp->tr_ifree.tr_logres = xfs_calc_ifree_reservation(mp); 838 resp->tr_ifree.tr_logcount = XFS_INACTIVE_LOG_COUNT; 839 resp->tr_ifree.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 840 841 resp->tr_addafork.tr_logres = xfs_calc_addafork_reservation(mp); 842 resp->tr_addafork.tr_logcount = XFS_ADDAFORK_LOG_COUNT; 843 resp->tr_addafork.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 844 845 resp->tr_attrinval.tr_logres = xfs_calc_attrinval_reservation(mp); 846 resp->tr_attrinval.tr_logcount = XFS_ATTRINVAL_LOG_COUNT; 847 resp->tr_attrinval.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 848 849 resp->tr_attrsetm.tr_logres = xfs_calc_attrsetm_reservation(mp); 850 resp->tr_attrsetm.tr_logcount = XFS_ATTRSET_LOG_COUNT; 851 resp->tr_attrsetm.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 852 853 resp->tr_attrrm.tr_logres = xfs_calc_attrrm_reservation(mp); 854 resp->tr_attrrm.tr_logcount = XFS_ATTRRM_LOG_COUNT; 855 resp->tr_attrrm.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 856 857 resp->tr_growrtalloc.tr_logres = xfs_calc_growrtalloc_reservation(mp); 858 resp->tr_growrtalloc.tr_logcount = XFS_DEFAULT_PERM_LOG_COUNT; 859 resp->tr_growrtalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 860 861 resp->tr_qm_dqalloc.tr_logres = xfs_calc_qm_dqalloc_reservation(mp); 862 resp->tr_qm_dqalloc.tr_logcount = XFS_WRITE_LOG_COUNT; 863 resp->tr_qm_dqalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 864 865 /* 866 * The following transactions are logged in logical format with 867 * a default log count. 868 */ 869 resp->tr_qm_sbchange.tr_logres = xfs_calc_qm_sbchange_reservation(mp); 870 resp->tr_qm_sbchange.tr_logcount = XFS_DEFAULT_LOG_COUNT; 871 872 resp->tr_qm_setqlim.tr_logres = xfs_calc_qm_setqlim_reservation(mp); 873 resp->tr_qm_setqlim.tr_logcount = XFS_DEFAULT_LOG_COUNT; 874 875 resp->tr_qm_quotaoff.tr_logres = xfs_calc_qm_quotaoff_reservation(mp); 876 resp->tr_qm_quotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT; 877 878 resp->tr_qm_equotaoff.tr_logres = 879 xfs_calc_qm_quotaoff_end_reservation(mp); 880 resp->tr_qm_equotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT; 881 882 resp->tr_sb.tr_logres = xfs_calc_sb_reservation(mp); 883 resp->tr_sb.tr_logcount = XFS_DEFAULT_LOG_COUNT; 884 885 /* The following transaction are logged in logical format */ 886 resp->tr_ichange.tr_logres = xfs_calc_ichange_reservation(mp); 887 resp->tr_growdata.tr_logres = xfs_calc_growdata_reservation(mp); 888 resp->tr_fsyncts.tr_logres = xfs_calc_swrite_reservation(mp); 889 resp->tr_writeid.tr_logres = xfs_calc_writeid_reservation(mp); 890 resp->tr_attrsetrt.tr_logres = xfs_calc_attrsetrt_reservation(mp); 891 resp->tr_clearagi.tr_logres = xfs_calc_clear_agi_bucket_reservation(mp); 892 resp->tr_growrtzero.tr_logres = xfs_calc_growrtzero_reservation(mp); 893 resp->tr_growrtfree.tr_logres = xfs_calc_growrtfree_reservation(mp); 894 } 895